RE: OSPF area 0

3.1. The backbone of the Autonomous System

        The OSPF backbone is the special OSPF Area 0 (often written as
        Area 0.0.0.0, since OSPF Area ID's are typically formatted as IP
        addresses). The OSPF backbone always contains all area border
        routers. The backbone is responsible for distributing routing
        information between non-backbone areas. The backbone must be
        contiguous. However, it need not be physically contiguous;
        backbone connectivity can be established/maintained through the
        configuration of virtual links.

    Area ID
        A 32-bit number identifying the area. The Area ID of 0.0.0.0 is
        reserved for the backbone.

From http://www.rfc-editor.org/rfc/rfc2328.txt

-----Mensaje original-----
De: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] En nombre de Ryan
West
Enviado el: Lunes, 13 de Abril de 2009 11:08 a.m.
Para: Khurram Noor; Cisco certification
Asunto: RE: OSPF area 0

Area 0 and 0.0.0.0 are the same. If the task asks for one over the over,
use what the task requires, they are both part of the backbone area.

-ryan

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Khurram Noor
Sent: Monday, April 13, 2009 11:03 AM
To: Cisco certification
Subject: OSPF area 0

Hello friends,
i have a questions that i want to clear up.

if in the lab ospf area 0 is not given, instead area 0.0.0.0 is given. then
what should be done. In IE i saw one such lab, in which there was no area 0.
so what they did in the solution is that they created a tunnel and assigned
in to area0. Should one take the same approach in lab, even if there is a
restriction on using additional ip address other then indicated in the lab.

-- 
Khurram Noor
Internetwork Professional
Blogs and organic groups at http://www.ccie.net